Function isBuiltinEnvironment

packages/vitest/src/integrations/env/loader.ts:13–17

(
  env: VitestEnvironment,
)

import { environments } from './index'

function isBuiltinEnvironment(
  env: VitestEnvironment,
): env is BuiltinEnvironment {
  return env in environments
}

const isWindows = process.platform === 'win32'
const _loaders = new Map<string, ModuleRunner>()